EP2806181A1 - Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung und Drehstromgenerator mit solch einer Vorrichtung - Google Patents

Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung und Drehstromgenerator mit solch einer Vorrichtung Download PDF

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Publication number
EP2806181A1
EP2806181A1 EP13305662.2A EP13305662A EP2806181A1 EP 2806181 A1 EP2806181 A1 EP 2806181A1 EP 13305662 A EP13305662 A EP 13305662A EP 2806181 A1 EP2806181 A1 EP 2806181A1
Authority
EP
European Patent Office
Prior art keywords
rotational member
outer ring
transmission device
rotation transmission
way clutch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13305662.2A
Other languages
English (en)
French (fr)
Inventor
Charles Chambonneau
François Champalou
Richard Corbett
Jeremy Detraigne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SKF AB filed Critical SKF AB
Priority to EP13305662.2A priority Critical patent/EP2806181A1/de
Priority to CN201410221689.0A priority patent/CN104179938A/zh
Priority to US14/285,989 priority patent/US9188173B2/en
Publication of EP2806181A1 publication Critical patent/EP2806181A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/064—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/064—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls
    • F16D41/066—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical
    • F16D41/067—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical and the members being distributed by a separate cage encircling the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
    • F16H7/023—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley

Definitions

  • the invention relates to a rotation-transmitting apparatus with a built-in one-way clutch, for example a pulley for an alternator of an automotive vehicle.
  • the invention also concerns an alternator comprising such a rotation-transmitting apparatus.
  • a transmission belt drives an outer crown of a pulley alternator, driving an internal hub.
  • This pulley is subject to speed and torque variations in service, mainly due to the engine acyclisms.
  • There are different ways to smooth the said variations exerted on the pulley for example by providing a one-way clutch between the hub and the pulley crown. In one rotation direction, the one-way clutch transmits a torque from the hub to the pulley crown while in the other rotation direction the pulley operates as freewheel.
  • the said pulley crown is generally made in metal and is rotationally supported by at least one rolling bearing comprising an inner ring, an outer ring and rolling elements between the said rings, the said rolling bearing parts being made in metal.
  • the rotation transmission device comprising such elements has a weight generating an important inertia.
  • a metallic pulley crown necessitates thermal coatings for preventing corrosion or improving the hardness, for example.
  • Such surface treatments are expensive and increase the rotation transmission device manufacturing cost.
  • the invention concerns a rotation transmission device with a built-in one-way clutch comprising an inside rotational member, an outside rotational member disposed concentrically with the inside rotational member, a one-way clutch radially disposed in an annular space defined between the inside rotational member and the outside rotational member, and at least one bearing disposed in the said annular space.
  • the outside rotational member is made in a plastic material and is overmoulded onto at least one stiffening insert.
  • the rotation transmission device weight is highly reduced enabling a device cost reduction, in particular reduced material, quantity and manufacturing costs.
  • the saved device weight implies also a reduced inertia and enhances climbing performance at device starts and stops.
  • such a rolling bearing may incorporate one or several of the following features as long as there is no contradiction:
  • the present invention also concerns an alternator comprising a rotation transmission device according to any of the preceding embodiments.
  • a rotation transmission device 1 of central axis X1 comprises an inside rotational member 2 of central axis X2, for example a hub, and an outside rotation member 3 of central axis X3, for example a pulley crown.
  • the axis X1, X2 and X3 are coincident and the inside rotational member 2 and the outside rotational member 3 are in relative rotation around these axis.
  • the terms "axial” and “radial” are defined in relation to the rotation axis X1 of the rotation transmission device 1. Then an axial portion is parallel to this axis of rotation and a radial portion is perpendicular to this axis.
  • the inside rotational member 2 comprises two lateral flanges 2a, 2b, an outer cylindrical surface 2c and an inner bore 2d.
  • a shaft (not represented) is dedicated to be inserted into the inner bore 2d in order to transmit a torque to the inside rotational member.
  • the outside rotational member 3 comprises two lateral flanges 3a, 3b, an outer surface 3c designed to cooperate with a belt (not illustrated) and an inner bore 3d.
  • the outer surface 3c comprises annular ribs to cooperate with a belt of the poly-V type for example.
  • the outside rotational member 3 comprises a stiffening insert 4.
  • the outside rotational member 3 is made from a polymer material and is overmoulded onto the said stiffening insert 4.
  • the outside rotational member can be manufactured from a lighter material than the usual metallic rotational members, enabling weight saving for the rotation transmission device 1.
  • the stiffening of the outside rotational member 3 is ensured by the stiffening insert 4 for supporting loads and torque.
  • the outside rotational member 3 is disposed concentrically with the inside rotational member 2 such as the inner bore 3d and the outer cylindrical surface 2c defines an annular space 5 wherein two rolling bearings 6, 7 and a one-way clutch 8 are mounted.
  • the rolling bearings 6, 7 are axially disposed on each side of the one-way clutch 8.
  • the two rolling bearings 6, 7 are similar and symmetrical with respect to a radial axis passing through the centre of the one-way-clutch.
  • the rolling bearings 6, 7 are radially disposed between the inner bore 3d of the outside rotational member 3 and the outer cylindrical surface 2c of the inside rotational member 2.
  • the rolling bearings 6, 7 comprise each an inner ring 6a, 7a and one row of rolling elements 6d, 7d, here balls.
  • the inner rings 6a, 7a comprise each a toroidal portion 6b, 7b defining an outer concave portion forming a raceway for the rolling elements 6d, 7d.
  • the toroidal portion 6b, 7b are each extended by an axial portion 6c, 7c being mounted by press-fitting onto the outer cylindrical surface 2c of the outside rotational member 2.
  • the inner rings 6a, 7a are made from a stamped metal sheet.
  • the one-way clutch comprises sliding elements 8a, such as sprags, which are circumferentially maintained by a cage 8b.
  • the outer cylindrical surface 2c of the inside rotational member 2 comprises an axial portion 2e forming a raceway for the sliding elements 8a.
  • the one-way clutch 8 may comprise an inner ring mounted onto the outer cylindrical surface 2c of the inside rotational member 2.
  • the rolling bearings 6, 7 and the one-way clutch also comprises a common unique outer ring consisting in the stiffening insert 4.
  • the outer ring 4 comprises an axial portion 4a axially extended on one side by a first toroidal portion 4b and axially extended on the other side by a second toroidal portion 4c.
  • the inner concave surface of the first toroidal portion 4b forms a raceway for the rolling elements 6d of the rolling bearing 6.
  • the inner concave surface of the second toroidal portion 4c forms a raceway for the rolling elements 7d of the rolling bearing 7.
  • the axial inner surface of the axial portion 4a forms a raceway for the sliding elements 8a of the one-way clutch 8.
  • a toroidal portion 4e is disposed between the first toroidal portion 4b and the axial portion 4a, and another toroidal portion 4f is disposed between the second toroidal portion 4c and the axial portion 4a.
  • Such toroidal portions 4e, 4f enables an increased radial space for a cage (not represented) for the rolling elements 6d, 7d.
  • the outside rotational member 3 is overmoulded onto the said outer ring 4 so as to form shoulders 3e, 3f in order to axially maintain the free ends of the toroidal portions 4b, 4c respectively.
  • the diameter of the raceways on the outer ring 4 for the rolling elements 6d, 7d is strictly higher than the diameter of the raceway on the outer ring 4 for the sliding elements 8a. Such a design permits an easy axial insertion of the rolling and sliding elements.
  • the outer cylindrical surface of the axial portion 4a of the outer ring 4 comprises radial ribs 4g alternated with recesses 4h.
  • the ribs 4g are all similar and circumferentially equally spaced.
  • the ribs 4g and the recesses 4h cooperate with concordant forms of the outside rotational member 3 which is overmoulded onto the said ribs 4g and recesses 4h. Such forms permit to block any rotation between the outer ring 4 and the overmoulding member 3.
  • FIG. 3 differs from the embodiment of Figure 1 in that the outside rotational member 3 comprises three stiffening inserts 9, 10, 11.
  • the outside rotational member 3 is made from a polymer material and is overmoulded onto the said stiffening inserts 9, 10, 11.
  • the rolling bearings 6, 7 each comprise an outer ring that consists in the stiffening inserts 9, 10 respectively.
  • the outer rings 9, 10 each comprises a first toroidal portion a axially extended 9a, 10a, a second toroidal portion 9b, 10b axially extending from the first toroidal portion 9a, 10a on one side, an axial portion 9c, 10c axially extending from the first toroidal portion 9a, 10a on the other side, respectively.
  • each of the first toroidal portions 9a, 10a form a raceway for the rolling elements 6d, 7d of the rolling bearing 6, 7 respectively.
  • the second toroidal portions 9b, 10b enable an increased radial space for a cage (not represented) for the rolling elements 6d, 7d.
  • the axial portions 9c, 10c may be each provided with at least one seal (not represented), the said seal being radially directed towards the axis X1.
  • Such seals permit to prevent the entry of pollution into the annular space 5 and to prevent leakage of lubricant to the outside for the rolling bearings 6, 7 and the one-way clutch 8.
  • the one-way clutch 8 comprises an outer ring that consists in the stiffening insert 11.
  • the outer ring 11 is cylindrical and comprises an inner surface forming a raceway for the sliding elements 8a.
  • the outer ring 11 of the one-way clutch 8 is axially located between the two outer rings 9, 10 of the rolling bearings 6, 7 respectively.
  • an axial gap is defined between the adjacent outer rings 9 and 11 and between the adjacent outer rings 10 and 11.
  • the said axial gaps between two adjacent outer rings are filled in by two annular radial portions 3g, 3h that radially extends from the inner bore 3d of the outside rotational member 3.
  • Such annular radial portions 3g, 3h permits to axially maintain the outer ring 11 of the one-way clutch.
  • the annular radial portion 3g also permits to axially maintain the outer ring 9 with the shoulder 3e; and the annular radial portion 3h permits to axially maintain the outer ring 10 with the shoulder 3f.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Pulleys (AREA)
EP13305662.2A 2013-05-23 2013-05-23 Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung und Drehstromgenerator mit solch einer Vorrichtung Withdrawn EP2806181A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13305662.2A EP2806181A1 (de) 2013-05-23 2013-05-23 Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung und Drehstromgenerator mit solch einer Vorrichtung
CN201410221689.0A CN104179938A (zh) 2013-05-23 2014-05-23 旋转传动装置及包括该装置的交流发电机
US14/285,989 US9188173B2 (en) 2013-05-23 2014-05-23 Rotation transmission device with built-in one-way clutch and alternator comprising such a device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13305662.2A EP2806181A1 (de) 2013-05-23 2013-05-23 Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung und Drehstromgenerator mit solch einer Vorrichtung

Publications (1)

Publication Number Publication Date
EP2806181A1 true EP2806181A1 (de) 2014-11-26

Family

ID=48771367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13305662.2A Withdrawn EP2806181A1 (de) 2013-05-23 2013-05-23 Rotationsübertragungsvorrichtung mit eingebauter Einwegkupplung und Drehstromgenerator mit solch einer Vorrichtung

Country Status (3)

Country Link
US (1) US9188173B2 (de)
EP (1) EP2806181A1 (de)
CN (1) CN104179938A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013103493A1 (de) * 2013-04-08 2014-10-23 Trw Automotive Gmbh Riemenscheibe und Getriebemutter mit einer solchen Riemenscheibe
DE102015203922A1 (de) * 2015-03-05 2016-09-08 Schaeffler Technologies AG & Co. KG Freilaufeinrichtung für ein Automatikgetriebe
US9845860B2 (en) * 2015-07-20 2017-12-19 Dayco Ip Holdings, Llc Retaining clamp for molded plastics
KR101943919B1 (ko) * 2017-08-08 2019-01-30 주식회사 만도 전동식 동력 보조 조향장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336771A (ja) * 2005-06-02 2006-12-14 Nsk Ltd プーリ装置及びその製造方法
JP2008267553A (ja) * 2007-04-24 2008-11-06 Ntn Corp プーリユニット
DE102010008935A1 (de) * 2010-02-23 2011-08-25 Schaeffler Technologies GmbH & Co. KG, 91074 Freilauf für ein Nebenaggregat in einem Zugmitteltrieb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5931755A (en) * 1996-03-06 1999-08-03 Mailey; John Pulley made from composite material
EP1067303B1 (de) * 1999-07-09 2008-12-31 Nsk Ltd Scheibe für einen Wechselstromgenerator mit eingebauter Einwegkupplung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336771A (ja) * 2005-06-02 2006-12-14 Nsk Ltd プーリ装置及びその製造方法
JP2008267553A (ja) * 2007-04-24 2008-11-06 Ntn Corp プーリユニット
DE102010008935A1 (de) * 2010-02-23 2011-08-25 Schaeffler Technologies GmbH & Co. KG, 91074 Freilauf für ein Nebenaggregat in einem Zugmitteltrieb

Also Published As

Publication number Publication date
US9188173B2 (en) 2015-11-17
US20140346000A1 (en) 2014-11-27
CN104179938A (zh) 2014-12-03

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